<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            background: #000;
        }

        .outer {
            width: 400px;
            height: 400px;
            border: 1px solid #fff;
            border-radius: 50%;
            position: relative;
            margin: 100px auto;
            animation: move 5s infinite linear;
        }

        .box {
            width: 20px;
            height: 20px;
            position: absolute;
            top: 12px;
            left: 100px;
            background: blue;
            border-radius: 50%;
        }

        .sun {
            width: 50px;
            height: 50px;
            background: -webkit-radial-gradient(red 0, orange 80%, rgba(240, 143, 17, 0.5));
            top: 175px;
            left: 175px;
            border-radius: 50%;
            position: absolute;
        }

        @keyframes move {
            to {
                transform: rotate(360deg);
            }
        }
    </style>
</head>

<body>
    <div class="outer">
        <div class="box"></div>
        <div class="sun"></div>
    </div>
</body>

</html>